[sdiy] where to get Piher trimmers PH15 range or replacements in Europe ?

[dragon.servicing]

HI,
just wondered if anyone could suggest where I could try to get some 
Piher trimmers PH15 range in Europe ?
I have tried Cricklewood Electronics here in the uk, but the ones they 
have in stock don't quite fit the boards correctly !
after looking at the data sheet for them I think the part number I need 
starts PT15YH06   which means that they have a built in thumb wheel, and 
maybe more importantly 8.8 mmm between the outside pins.
or does anyone know of any equivalents ?
sorry for the questions, in case anyone is wondering they are for some 
old Devtronix Organ Oscillator boards.
regards Peter